Improvement in force-pomps having concentric pistons



eluded 51am parte emo.

PETER M. KAFER, oF. TRENTo N,NEW`JERsE-Y.

Letters Patent No. 94,610, dated eptember 7, 1869.

l IMPRGVEMENT IN FORCE-PUMPS HAVING CONCENTRIC PAISTONS.

The Schedule referred to n them Letters Patent and making pakt of the lame.

To whom it may concern:

Be it known that I, PETER M. KAFER, of Trenton, New Jersey, have invented new and useful Improvements in Double-Acting Force-Pumps; and I do hereby declare the following to be a full and exact description of the same, reference being had to the drawings that aecompanyand form part of these specifications, 'in which- Figure l is a longitudinal bisection.

Figure 2, cross-section in line m n.

Figure 3, sectional view, showing the feed-valves.

A is an inside pump-cylinder.

B, the piston, working in the cylinder A.V

C, piston-rod. Y

I), another cylinder, outside of and surroumling the cylinder A.

E, the piston working in D and over the cylinder A.

l1* and IS", the piston-rods working thepiston E.

g 'g g g are the ind notion-valves, four at each end of the box.

l: h h h are the reduction-valves. i yi, valve-chambers. :c x, the source of supply, or supply-chambers. s z, the exhaust-chambers, the valve-chambers i -i connecting with the former by the imlucting-valves y g, and with the latter by the educting-valves hIv h.

From the chambers i z the hose may lead oti as desired.

The object of my invention is to provide more ready means of varying the capacity of a force-pump, and is especially adapted to steam tire-engines, where a variation is often required according tothe distance of the engine from the lire.

My device allows of the working of several pistons at once, or of any one or more of the several at the same time. The various piston-rods may be oonnected together by any suitable merhanical device that will provide for their being united or separated readily.

I am aware that pumps of some capacity for variation ot`-tliis nature have been before used but none possessing the modes of doing itor the qualities of mine. Y

I may work the inside piston B, leaving the piston E, or any others, if there arepothers, entirely at, rest; or I may work E, and leave all the others at rest; or l may work two or more, and leave others, if there are more, at rest; or I may work all at one time. Thus,

it will be readily perceived` that all the pistons not ae` tually in the act of forcing away the water, are at rest, and herein lies one of the features of my invention, and that is a great saving of friction, as other pumps, seeking the same ends, have all their pistons in Inotion, though producing no eii'ects This motion, sirnply in the case of packed or closely-fitting pistons, would use up much oi' the power or force of' the en- Witnesses. v

PETER- M. KAFER.

Witnesses:

JAMES S. Krenn, HAMILTON JAY. 

